"There are many here among usWho feel that life is but a joke

So far the joker and thief seem to be a lonely duo. They’re viewed as the outcasts of their town, so it seems strange that the thief would talk about people “among us”. Maybe he is just referring to the other people in wherever they’re located, the businessman, plowmen, and people in watchtowers. No one in this place appreciates the beauty of life. The thief and joker are very skeptical about how good life really is, and the rest just view it as a joke. No one knows what any of it is worth.

Mythologically perhaps the Joker is Loki

“After Loki had been chased away by Thor for insulting all the gods and goddesses, Loki was then sought out and chained to a rock by the entrails of his son Narvi , who had been torn to pieces by his son, Vali, who had been transformed into a ravenous wolf. The faithful Sigyn kept watch over her husband, catching the poison from the serpent that Skadi placed over Loki’s head. It was said that, when Sigyn left to empty the bowl, the poison would drip into Loki’s eyes. His writhing from the pain caused earthquakes.“

And the Thief is Prometheus”A trickster figure who is credited with the creation of man from clay, and who defies the gods and gives fire to humanity, an act that enabled progress and civilization. Prometheus is known for his intelligence and as a champion of mankind.“